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Financial Instruments (Schedule Of Pretax Effect On Net Income (Loss) And Other Comprehensive Income (Loss) Of Derivative Instruments Classified As Cash Flow Hedges) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Aluminum Futures Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax | $ 7,598 | $ (4,525) | $ 6,215
Flexible Packaging Films |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax | 0 | 0 | 0
Cost of Sales [Member] | Aluminum Futures Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax | 4,508 | 1,022 | 5,787
Cost of Sales [Member] | Flexible Packaging Films |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 61 | 61 | 63
Selling, General and Administrative Expenses [Member] | Flexible Packaging Films |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax | 4,196 | 3,269 | (2,415)
Selling, General and Administrative Expenses [Member] | Foreign Currency Forward Contracts | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | $ 3,011 | $ 1,378 | $ (337)

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